GPT-5.6 Sol vs Kimi K2.5
GPT-5.6 Sol (OpenAI) and Kimi K2.5 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.6 Sol leads on overall intelligence (ECI 162 vs 148).
- Kimi K2.5 is cheaper on input tokens — $0.38 vs $5.00 per 1M.
- GPT-5.6 Sol has a larger context window (1.1M vs 262K tokens).
- GPT-5.6 Sol ranks higher for coding (95th vs 50th percentile).
| Attribute | GPT-5.6 Sol | Kimi K2.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 162 | 148 |
| Coding | 95 | 50 |
| Math | 97 | 53 |
| Reasoning & Knowledge | 95 | 37 |
| Agentic & Tools | 67 | 54 |
| Specifications | ||
| Developer | OpenAI | Moonshot |
| Family | GPT | Kimi |
| Released | Jul 9, 2026 | Feb 2, 2026 |
| Parameters | — | 1T |
| Availability | API access | Open weights (unrestricted) |
| Context window | 1.1M | 262K |
| Price — $/M input | $5.00 | $0.38 |
| Price — $/M output | $30.00 | $2.02 |
| Inputs | file, image, text | text, image |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 92% |
| APEX | 40% | 14% |
| ARC-AGI | 98% | 65% |
| ARC-AGI-2 | 93% | 12% |
| GPQA Diamond | 93% | 88% |
| Humanity's Last Exam | 47% | 24% |
| SciCode | 56% | 49% |
| SimpleBench | 72% | 47% |
| SimpleQA Verified | 72% | 34% |
| WeirdML | 89% | 46% |
| τ²-bench | 85% | 96% |
| FrontierMath | — | 28% |
| FrontierMath Tier 4 | — | 4% |
| SWE-bench Verified | — | 74% |
| Terminal-Bench | — | 43% |
| WebDev Arena | — | 1431 |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is GPT-5.6 Sol better than Kimi K2.5?
On Epoch AI's Capabilities Index, GPT-5.6 Sol scores higher (162) than Kimi K2.5 (148). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GPT-5.6 Sol or Kimi K2.5?
Kimi K2.5 is cheaper on input tokens at $0.38 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, GPT-5.6 Sol or Kimi K2.5?
GPT-5.6 Sol supports up to 1.1M tokens, compared with 262K for the other.
Which is better for coding, GPT-5.6 Sol or Kimi K2.5?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, GPT-5.6 Sol ranks higher — 95th vs 50th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.